C8 Flashcards
What is potable water
It’s not the same as pure water as potable water has dissolved substances in it
Why does potable water contain dissolved substances
As it can be rain water picked up in reservoir and it’s okay to drink
What is finite resources
They can’t be quickly replaced as they are being used such as fossil fuels, we use millions of kg of it everyday but fossil fuels form a lot slower than this. So it will eventually run out, metal is a finite resource
What is a renewable resource
It is something that can be replaced as quickly as it is used so it will never run out
What do you need to do to produce potable water
We pick a good source of fresh water (river)
We pass the water through a filter beds to remove leaves or suspended materials
Water is then sterilised ty kill microbes in the water
What is distillation
It reduces levels of dissolved minerals down to an acceptable water for potable water
To carry out distillation we pass it through a distilators or membranes calmed revers or osmosis both require a lot of energy and money
What’s the easiest way to produce potable water
Using ground water from resivours is safe to drink after being treated by chlorine can be polluted with fertilisers
What does waste water contain
Organic molecules like urine graces and harmful micro organisms
How is waste water treated
Sewage is screened by going through a mesh removing solids and grit
It settles in large settlement tanks and is digested by anaerobic bacteria
Abstain from using 02 as this can be used in biogas electricity
What can digested sludge be used for
It can be used for fertilisation and farming
The liquid effluent contain harmed micro organisms and air is bubbled in liquid to allow aerobic bacteria to digest it
After the water discharged to river or sea
How can we extract metals that are running out
We extract it from low grade ores only containing a small amount
What’s phytoming
Plants grow on land and contain metal compounds. They absorb the metal compounds and it’s concentrated in their tissue. The plants are harvested and burnt, the ash contains high concentrations of metal
That bioleaching
Bacteria is mixed with low grade ores. The bacteria carry out chemical reactions and produce solutions called reactions and levanter contains metal compounds.
What happens at the end of phytoming and bioleaching
The metal has been extracted from the low grade ore. In case if copper compounds we can displace the copper using iron as it’s more reactive or we can use electrolysis
What does a life assembly asses
It asses environmental impacts of a manufactured product
- processing and extracting raw materials 
- many modern products contain copper
- polymers like plastic are produced using crude oil which is extracted from the ground
